package com.example.demo.demos.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author TeaCold
 * @date 2024/8/9 13:26
 * @desc 数据库连接工具类
 **/
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
   static {
       // 加载 mybatis核心配置文件，获取 SqlSessionFactory
       try {
           String resource = "mybatis-config.xml";
           InputStream inputStream = Resources.getResourceAsStream(resource);
           sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
       } catch (IOException e) {
           e.printStackTrace();
       }
   }
    //既然有了sqlSessionFactory,顾名思义，我们就可以从中获得sqlSession的实例了
    //sqlSession 完全包含了面向数据库执行SQL命令所需的所有方法
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }


}
